Android 18

Android 18 (人造人間18号Jinzōningen Jū Hachi-go) is Dr. Gero's eighteenth android creation (although she is a cyborg), designed to serve Gero's vendetta against Goku. While her interests do not deviate from this expectation, Android 18's curiosity to activateAndroid 16 in spite of Gero's orders not to do so lead Android 17 to take it upon himself to murder Gero (maybe from the fact that he kidnapped them while they were human). She later becomes the wife of Krillin and the mother of their only daughter, Marron. She also unofficially joins the Z Fighters. Although she does not take part in any battles against Majin Buu, she fights Super 17 in Dragon Ball GT.

When Dr. Gero arrives at his laboratory (after he and Android 19 failed to combat the Z Fighters, with 19 getting killed by Vegeta), he activates Androids 17 and 18. There is another android yet to be activated. Androids 17 and 18 want to activate him but Dr. Gero refuses. Android 17 punches Gero's chest and kicks his head off and squashes it. They eventually activate him and pursue their quest to find Goku. Android 18 fights Super Saiyan Vegeta. Android 18 eventually gains the upper hand and breaks his arm. The others try to help but are easily defeated. The androids approach Krillin but have no interest in killing him. Krillin tries to persuade them to drop their search for Goku. 18 is attracted to him and goes over to kiss the terrified Krillin on the cheek before continuing their quest to find Goku. This is when Krillin starts to fall in love with 18.